# onsip/SIP.js

A simple, intuitive, and powerful JavaScript signaling library

Repository: https://github.com/onsip/SIP.js
Canonical: https://ross.abutalabs.com/products/sipjs
Homepage: https://sipjs.com
Language: TypeScript
License: MIT
License Family: permissive
Topics: sipjs, webrtc, javascript, sip, voip, typescript, nodejs
Last push: 2026-06-15T19:18:20+00:00

## Health v2 (maintenance only)
Score: 62/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 87, release rhythm 8, longevity 100
- inputs: {"age_days": 4639, "days_push": 79, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2094, forks 727 (observed 2026-08-28T04:06:13.091904+00:00)

## What it is
SIP.js is a JavaScript/TypeScript SIP signaling library for building WebRTC applications with audio/video calling, messaging, and presence. It supports SIP over WebSocket and works with standards-compliant servers like Asterisk and FreeSWITCH.

## Use cases
- add sip-based audio and video calls to a web app
- build a browser-based webrtc softphone
- send and receive sip instant messages in the browser
- implement click-to-call on a website
- connect a web app to an asterisk or freeswitch pbx
- share screen or desktop during web calls
- send dtmf tones from a web application

## When to choose
- you need a full sip signaling stack in a web browser
- you want webrtc calling with hold, transfer, and early media support
- your backend is a standards-compliant sip server like asterisk or freeswitch
- you want a simple high-level API (SimpleUser) or a full low-level SIP API

## When to avoid
- you need support for non-browser environments like React Native or Node.js out of the box
- you need a non-SIP signaling protocol
- you need extensive media processing beyond basic session description handling
- you need guaranteed support for older or niche browsers

## Facets
- artifact type: library
- maturity: active
- function: websocket, http-client, sdk
- domain: web-development, networking, apis
- platform: browser
- tags: sip, webrtc, voip, signaling, audio-video-calls, instant-messaging, telephony, real-time, nodejs, javascript, typescript

## Member repositories
- onsip/SIP.js (main) score 62

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:13.091904+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:55:26.197646+00:00, confidence not recorded.
  - readme: https://github.com/onsip/SIP.js (fetched 2026-08-28T04:06:13.091904+00:00, sha d5f3c5979111)
  - homepage: https://sipjs.com (fetched 2026-08-29T10:35:21.707730+00:00, sha bfb4248962bc)
  - site_page: https://sipjs.com/aboutus (fetched 2026-08-29T10:35:21.716752+00:00, sha 87638af4feef)
  - registry_npm: https://registry.npmjs.org/sip.js (fetched 2026-08-29T10:35:21.720300+00:00, sha 5d86a10b6bed)
  - site_page: https://sipjs.com/faq (fetched 2026-08-29T10:35:21.718534+00:00, sha 8e689264e440)
- Data as of 2026-08-30T08:39:29.467469+00:00.